I've put together an update package for UK NST/Gs (works on US models as well, which is what I have). It results in a UK-style experience (same splash screens, Oxford dictionary, keyboard entry of letters with diacritical marks, language selection, etc.) with connection to the US B&N servers.
The idea is to allow continued use of the devices
registered, which results in longer battery life and fewer issues with WiFi and so on.
The update does not require rooting, although that is possible after registration. Because I had to fiddle with the official 1.2.2 US update zip, the internal signature is broken and so the update must be done using ClockwordMod.
Detailed procedure (with pictures)
here.
Very new as of this posting, looking for testers, especially outside the US.